CN102705294A - High-pressure cylinder and excavator comprising same - Google Patents

High-pressure cylinder and excavator comprising same Download PDF

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Publication number
CN102705294A
CN102705294A CN2012102119694A CN201210211969A CN102705294A CN 102705294 A CN102705294 A CN 102705294A CN 2012102119694 A CN2012102119694 A CN 2012102119694A CN 201210211969 A CN201210211969 A CN 201210211969A CN 102705294 A CN102705294 A CN 102705294A
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CN
China
Prior art keywords
piston rod
buffer area
cylinder
oil cylinder
piston
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Application number
CN2012102119694A
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Chinese (zh)
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CN102705294B (en
Inventor
李中才
黄昌黎
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上海三一重机有限公司
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Priority to CN201210211969.4A priority Critical patent/CN102705294B/en
Publication of CN102705294A publication Critical patent/CN102705294A/en
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Publication of CN102705294B publication Critical patent/CN102705294B/en
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Abstract

The invention discloses a high-pressure cylinder and an excavator comprising the same and belongs to the technical field of hydraulic cylinders. The cylinder comprises a piston rod, a cylinder barrel and a piston, wherein the piston is fixed on the piston rod; the end of the cylinder barrel is provided with a cylinder barrel end cover; a first buffer area and a second buffer area are formed between the piston and the end of the piston rod on the piston rod; the first buffer area is far away from the direction of the end of the piston rod; a plurality of grooves which are distributed on the surface of the piston rod along the axial direction are formed in the first buffer area; the depths of the grooves are gradually increased along the direction of the cylinder barrel end cover; and the cylinder barrel end cover is provided with a first cavity and a second cavity which are matched with the first buffer area and the second buffer area, and an oil port which is communicated with the cavities is formed on the cylinder barrel end cover. Two buffer devices, namely the first buffer area and the second buffer area, are arranged in a rodless cavity, and the piston rod and the buffer devices are integrated, so that the cylinder is simple in structure and has good buffering effect, and the service life of the cylinder is prolonged.

Description

A kind of high-voltage oil cylinder and comprise the excavator of this oil cylinder
Technical field
The present invention relates to technical field of hydraulic oil cylinder, particularly a kind of high-voltage oil cylinder and comprise the excavator of this oil cylinder.
Background technique
Hydraulic jack is widely used parts in the engineering machinery, is a kind of straight line moving type executive component commonly used in the hydraulic system.In the oil cylinder working procedure; Piston needs continuous to-and-fro motion, and when piston rod stretched out or be withdrawn into limit position, piston end surface can produce very big impact to end cap and bottom surface; Produce very big inertial force and impulsive load, may cause the damage of hydraulic jack.For the purpose of protecting oil cylinder and safety, oil cylinder inside need be provided with damping device, the stability of machine work when guaranteeing that oil cylinder runs to end of travel.Existing engineering machinery oil cylinder rodless cavity generally all is provided with a cover damping device.
As shown in Figure 1, the high-voltage oil cylinder that is provided with damping device in the present rodless cavity mainly comprises cylinder barrel 20, piston rod 21 and piston 22, and is as shown in Figure 1, and piston 22 is fixed in first end of piston rod 21.First end of piston rod 21 passes piston 22, and piston 22 is anchored on first end of piston rod 21 through locking nut 23.The end face of first end of piston rod 21 is provided with blind hole 30, is provided with cylinder curved surface pin 25 in the blind hole 30.Be provided with cushion hole 26 in the cylinder barrel bottom.The end away from piston one end of cylinder curved surface pin 25 is set to taper, and the axial section of taper is parabolic.Also be provided with the throttle orifice 28 that communicates with cushion hole 26 in cylinder barrel 20 bottoms, be provided with one-way throttle valve 27 in the throttle orifice 28.Also be provided with the hydraulic fluid port 29 that communicates with cushion hole 26 in cylinder barrel 20 bottoms.This high-voltage oil cylinder can realize that throttling gradually alleviates the impact of piston to cylinder barrel, and the breakout pressure can reduce oil cylinder and start the time.
But also there is following problem in present hydraulic jack; The structure of oil cylinder is comparatively complicated, and cushioning effect is relatively poor, and the cushioning effect of oil cylinder having relatively high expectations to taper; Because the whole buffering course of oil cylinder will be accomplished by taper, and is also higher to the processing request of taper.
Summary of the invention
In order to solve present high-voltage oil cylinder complex structure, cushioning effect difference and, a kind of high-voltage oil cylinder to be provided at present to the processing request problem of higher of taper in the oil cylinder.Concrete technological scheme is following:
Be provided with the high-voltage oil cylinder of damping device in a kind of rodless cavity; Said high-voltage oil cylinder comprises piston rod, cylinder barrel and piston; Said piston is fixed on the said piston rod, and wherein, said cylinder barrel end is provided with the cylinder barrel end cap; Between said piston and said piston rod end, be provided with first buffer area and second buffer area on the said piston rod; Said first buffer area is away from said piston rod end direction, and said first buffer area is provided with many grooves that are distributed in said piston rod surface vertically, and said depth of groove is along deepening gradually to said cylinder barrel end cap direction; Said cylinder barrel end cap is provided with first cavity and second cavity that is complementary with said first buffer area, said second buffer area, and said cylinder barrel end cap also is provided with the hydraulic fluid port that is connected with said cavity.
Preferably; Be provided with buffering spill port and oil inlet hole in said second buffer area; Said oil inlet hole radially runs through said piston rod, and said buffering spill port to set and be connected with said spill port, is provided with one-way valve in the said buffering spill port from said piston rod end face along said piston rod.
Preferably, said second buffer area is provided with many and is distributed in the throttling groove that is uniformly distributed with on the said piston rod circumferencial direction of compensating groove or edge of said piston rod surface vertically, and said compensating groove or throttling groove are along deepening gradually to said cylinder barrel end cap direction.
Preferably, said second buffer area is designed to the cylndrical surface.
Preferably, said groove is parallel to each other and spacing equates.
Preferably, said hydraulic fluid port is connected with said first cavity.
Preferably, the said first buffer area diameter of piston rod is greater than the said second buffer area diameter of piston rod.
Preferably, said second buffer area and the said second cavity fit system are Spielpassung.
Preferably, said one-way valve comprise steel ball, holddown spring that is connected with said steel ball and the spring device for screwing up that is connected with said holddown spring.
A kind of excavator, said excavator are equipped with above-mentioned each described high-voltage oil cylinder.
Compared with prior art; The high-voltage oil cylinder that provides in the technique scheme and comprise that the excavator of this oil cylinder has the following advantages: through in rodless cavity, being provided with first buffer area and two damping devices of second buffer area; And adopt piston rod and damping device integrated design; Not only cylinder structure is simpler, and cushioning effect is better, has prolonged oil cylinder working life.
Description of drawings
In order to be illustrated more clearly in the technological scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is an existing technology high-voltage oil cylinder structural representation;
Fig. 2 is the high-voltage oil cylinder piston rod construction schematic representation that provides in the embodiment of the invention;
Fig. 3 is the high-voltage oil cylinder cylinder barrel assembly structure schematic representation that provides in the embodiment of the invention;
Fig. 4 is the high-voltage oil cylinder structural representation that provides in the embodiment of the invention;
Fig. 5 is the high-voltage oil cylinder buffering course schematic representation that provides in the embodiment of the invention;
Fig. 6 is that the high-voltage oil cylinder piston that provides in the embodiment of the invention stretches out the process schematic representation.
In the accompanying drawing, the component list of each label representative is following:
1 piston rod, 2 cylinder barrels, 3 pistons, 4 cylinder barrel end caps, 5 first buffer areas, 6 second buffer areas, 7 grooves; 8 first cavitys, 9 second cavitys, 10 hydraulic fluid ports, 11 oil inlet holes, 12 buffering spill ports, 13 one-way valves, 131 steel balls; 132 holddown springs, 133 spring device for screwing up, 14 low-pressure hydraulic oils, 15 high-pressure and hydraulics oil, 20 cylinder barrels, 21 piston rods, 22 pistons; 23 locking nuts, 25 cylinder curved surface pins, 26 cushion holes, 27 one-way throttle valves, 28 throttle orifices, 29 hydraulic fluid ports, 30 blind holes.
Embodiment
For making the object of the invention, technological scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
To shown in Figure 4, the embodiment of the invention provides a kind of high-voltage oil cylinder, comprises piston rod 1, cylinder barrel 2 and piston 3 like Fig. 2; Piston 3 is fixed on the piston rod 1; Wherein, cylinder barrel 2 ends are provided with cylinder barrel end cap 4, between piston 3 and piston rod 1 end, are provided with first buffer area 5 and second buffer area 6 on the piston rod 1; First buffer area 5 is away from piston rod 1 end direction; First buffer area 5 is provided with many grooves 7 that are distributed in piston rod 1 surface vertically, and deepen to cylinder barrel end cap 4 directions gradually on groove 7 degree of depth edge, and groove 7 is parallel to each other and spacing equates.Cylinder barrel end cap 4 is provided with first cavity 8 and second cavity 9 that is complementary with first buffer area 5, second buffer area 6, and cylinder barrel end cap 4 also is provided with the hydraulic fluid port 10 that is connected with first cavity 8.When piston rod 1 moved to cylinder barrel 2 bottoms, first buffer area 5 got into first cavity 8 and cooperates the throttling of realization variable, after first buffer area 5 gets into first cavity 8; It is big that amount of restriction becomes gradually; Piston 3 movement velocitys reduce gradually, under second damping device cooperates, make buffering course comparatively steady.
Be provided with buffering spill port 12 and oil inlet hole 11 in second buffer area 6, spill port 11 radially runs through piston rod 1, and buffering oil inlet hole 12 is 1 axially set and be connected with spill port 11 from piston rod 1 end face along piston rod, is provided with one-way valve 13 in the buffering oil inlet hole 12.One-way valve 13 comprises steel ball 131, holddown spring 132 that is connected with steel ball 131 and the spring device for screwing up 133 that is connected with holddown spring 132.Cushion hole 12 is coaxial with piston 3, and the axis of hydraulic fluid port 10 is parallel with spill port 11.
In addition, second buffer area 6 also can be designed as to have many and is distributed in the compensating groove on piston rod 1 surface vertically or has the throttling groove that is uniformly distributed with along on piston rod 1 circumferencial direction, and wherein compensating groove or throttling groove are along deepening gradually to cylinder barrel end cap 4 directions.Simultaneously, second buffer area 6 also can be designed to have the structure of cylndrical surface.
First buffer area, 5 diameter of piston rod are greater than second buffer area, 6 diameter of piston rod.Second buffer area 6 and second cavity, 9 fit systems are Spielpassung; Amount of restriction when adjusting the control throttling through second buffer area 6 and second cavity, 9 Spielpassung; Auxiliary first buffer area 5 is the speed of adjustment oil cylinder deceleration further, better alleviates the collision of piston 3 and cylinder barrel end cap 4.
Below the simple working principle of describing the embodiment of the invention.
As shown in Figure 5; When oil cylinder piston bar 1 retraction, hydraulic oil promotes piston 3 motions, and rodless cavity hydraulic oil is that low pressure oil is gone into fuel tank 15 times; Along with piston 3 continues operation when getting into buffer area; At this moment first buffer area 5 inserts first cavity 8 on the cylinder barrel end cap on the piston rod 1, and second buffer area 6 inserts cylinder barrel end cap second cavity 9 on the piston rod, and wherein first buffer area 5 leans on the groove 7 that throttle part is progressively deepened on the piston rod to form the hyperbaric chamber that raises gradually at piston and end cap first cavity 8 front ends; The motion speed that progressively slows down cushions; 6 of second buffer areas lean on piston rod 3 and cylinder cover 4 Spielpassung between the two, play certain damping function and assist first buffer area, 5 reducing speeds, alleviate the high pressure that first buffer area 5 forms; Sealing system on the protection piston is after accomplishing buffering course, during the oil cylinder rodless cavity oil-feed; As shown in Figure 6; At this moment high-pressure and hydraulic oil 14 gets into from hydraulic fluid port, and a part of high-pressure and hydraulic oil 14 promotes the piston rod first buffer area front end, and a part of in addition high-pressure and hydraulic oil 14 gets in the buffering oil inlet hole 12 through spill port on the piston rod 11; Further push steel ball 131 open and be full of second cavity 9 rapidly through one-way valve 13; Piston 3 oppositely starts, and accelerates toggle speed, makes piston 3 can not produce the phenomenon that starts slowly or start difficulty because of thrust is not enough.
The embodiment of the invention also discloses a kind of excavator, this excavator is equipped with above-mentioned described high-voltage oil cylinder.Other part of excavator can be with reference to existing technology, does not do at this and gives unnecessary details.
The buffer structure that disclosed high-voltage oil cylinder of the embodiment of the invention and the excavator that comprises this oil cylinder adopt through design comprises first buffer area and second buffer area; Two buffer area actings in conjunction realize buffering during buffering; Good buffer effect; And can reduce the rodless cavity compensator or trimmer pressure effectively, and prevent to cushion high temperature, the high pressure that moment produces and damage the piston seal system, prolong oil cylinder working life; Piston rod and damping device are designed to integratedly in addition, make structure simpler, and cushioning effect is better, the breakout pressure in the time of also reducing oil cylinder simultaneously better and start.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. high-voltage oil cylinder; Comprise piston rod (1), cylinder barrel (2) and piston (3); Said piston (3) is fixed on the said piston rod (1); It is characterized in that; Said cylinder barrel (2) end is provided with cylinder barrel end cap (4), and said piston rod (1) is gone up and between said piston (3) and said piston rod (1) end, is provided with first buffer area (5) and second buffer area (6), and said first buffer area (5) is away from said piston rod (1) end direction; Said first buffer area (5) is provided with many grooves (7) that are distributed in said piston rod (1) surface vertically; Deepen to said cylinder barrel end cap (4) direction gradually on said groove (7) degree of depth edge, and said cylinder barrel end cap (4) is provided with first cavity (8) and second cavity (9) that is complementary with said first buffer area (5), said second buffer area (6), and said cylinder barrel end cap (4) also is provided with the hydraulic fluid port (10) that is connected with said cavity.
2. high-voltage oil cylinder according to claim 1; It is characterized in that; Be provided with buffering spill port (12) and oil inlet hole (11) in said second buffer area; Said oil inlet hole (11) radially runs through said piston rod (1), and said buffering spill port (12) is axially set and be connected with said oil inlet hole (11) from said piston rod (1) end face along said piston rod (1), is provided with one-way valve (13) in the said buffering spill port (12).
3. high-voltage oil cylinder according to claim 1; It is characterized in that; Said second buffer area (6) is provided with many and is distributed in the throttling groove that is uniformly distributed with on surperficial compensating groove of said piston rod (1) or edge said piston rod (1) circumferencial direction vertically, and said compensating groove or throttling groove are along deepening gradually to said cylinder barrel end cap (4) direction.
4. high-voltage oil cylinder according to claim 1 is characterized in that, said second buffer area is designed to the cylndrical surface.
5. high-voltage oil cylinder according to claim 1 is characterized in that, many said grooves (7) are parallel to each other and spacing equates.
6. high-voltage oil cylinder according to claim 1 is characterized in that, said hydraulic fluid port (10) is connected with said first cavity (8).
7. high-voltage oil cylinder according to claim 1 is characterized in that, said first buffer area (5) diameter of piston rod is greater than said second buffer area (6) diameter of piston rod.
8. high-voltage oil cylinder according to claim 1 is characterized in that, said second buffer area (6) and said second cavity (9) fit system are Spielpassung.
9. high-voltage oil cylinder according to claim 2; It is characterized in that said one-way valve (13) comprises steel ball (131), holddown spring (132) that is connected with said steel ball (131) and the spring device for screwing up (133) that is connected with said holddown spring (132).
10. an excavator is characterized in that, said excavator is equipped with each described high-voltage oil cylinder of claim 1 to 8.
CN201210211969.4A 2012-06-26 2012-06-26 A kind of high-voltage oil cylinder and comprise the excavator of this oil cylinder Expired - Fee Related CN102705294B (en)

Priority Applications (1)

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CN201210211969.4A CN102705294B (en) 2012-06-26 2012-06-26 A kind of high-voltage oil cylinder and comprise the excavator of this oil cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210211969.4A CN102705294B (en) 2012-06-26 2012-06-26 A kind of high-voltage oil cylinder and comprise the excavator of this oil cylinder

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CN102705294A true CN102705294A (en) 2012-10-03
CN102705294B CN102705294B (en) 2016-01-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105179366A (en) * 2015-10-09 2015-12-23 济南大学 Flexible vortex power, automatic-deslagging and backlog-free hydraulic cylinder
CN108799227A (en) * 2018-06-23 2018-11-13 江苏创良智能数控科技有限公司 A kind of cylinder buffer valve and numerically-controlled machine tool deceleration oil cylinder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441005A1 (en) * 1983-11-16 1985-05-30 Wabco Westinghouse Gmbh Pneumatic working cylinder with pneumatic end-position damping
CN201293007Y (en) * 2008-11-17 2009-08-19 郑州宇通重工有限公司 Amortization structure suitable for hydraulic cylinder tail end
CN201730894U (en) * 2010-08-06 2011-02-02 安徽合力股份有限公司 Pneumatic and hydraulic cylinder with oil delivering and air storage functions
CN102155457A (en) * 2010-07-23 2011-08-17 三一重工股份有限公司 Hydraulic oil cylinder, hydraulic buffering system, excavator and concrete pump truck
CN202215533U (en) * 2011-08-12 2012-05-09 三一重机有限公司 Novel bidirectional buffering structure of high pressure oil cylinder
CN202220773U (en) * 2011-09-05 2012-05-16 扬州扬宝机械有限公司 Hydraulic pressure buffer cylinder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441005A1 (en) * 1983-11-16 1985-05-30 Wabco Westinghouse Gmbh Pneumatic working cylinder with pneumatic end-position damping
CN201293007Y (en) * 2008-11-17 2009-08-19 郑州宇通重工有限公司 Amortization structure suitable for hydraulic cylinder tail end
CN102155457A (en) * 2010-07-23 2011-08-17 三一重工股份有限公司 Hydraulic oil cylinder, hydraulic buffering system, excavator and concrete pump truck
CN201730894U (en) * 2010-08-06 2011-02-02 安徽合力股份有限公司 Pneumatic and hydraulic cylinder with oil delivering and air storage functions
CN202215533U (en) * 2011-08-12 2012-05-09 三一重机有限公司 Novel bidirectional buffering structure of high pressure oil cylinder
CN202220773U (en) * 2011-09-05 2012-05-16 扬州扬宝机械有限公司 Hydraulic pressure buffer cylinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105179366A (en) * 2015-10-09 2015-12-23 济南大学 Flexible vortex power, automatic-deslagging and backlog-free hydraulic cylinder
CN108799227A (en) * 2018-06-23 2018-11-13 江苏创良智能数控科技有限公司 A kind of cylinder buffer valve and numerically-controlled machine tool deceleration oil cylinder

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